To my understanding , the above select will look for the number between 0 to 9 which should no exceed character 10.
If my above statement correct, then i should get the 8 digit mobile number in below select statement, but i am getting 10 and 8 digit number. it suppose to look for 0 to 9 and give 8 digit mobile number. please correct me if i am wrong.
To my understanding , the above select will look for the number between 0 to 9 which should no exceed character 10.
It will look for exactly 10 digits in a row.
These exact 10 digits can appear anywhere in the line.
Quote:
If my above statement correct, then i should get the 8 digit mobile number in below select statement, but i am getting 10 and 8 digit number. it suppose to look for 0 to 9 and give 8 digit mobile number. please correct me if i am wrong.
It will find 8 digits inside 10 digits, the same way it will find 'gas' inside 'gasoline'.
To find only 8 digits you must be more specific. Perhaps
Code:
grep ' [0-9]{8}$'
to tell it there must be a space in front, and that the string must end at the end of the line.
Matching a specified number of occurrences
A BRE interval expression has the syntax ``\{l\}'', ``\{l,\}'',
or ``\{l,u\}''.
An ERE interval expression has the syntax ``{l}'', ``{l,}'', or
``{l,u}''.
Still i am not able to get you completely what you say
^ Matches the beginning of lines.
. Matches any single character.
Which means the command matches any character in the beginning of the line followed by any single character and then followed by checking any character between 2 or 3
in the first column and not able to get what this w for ?
Still i am not able to get you completely what you say
^ Matches the beginning of lines.
. Matches any single character.
Which means the command matches any character in the beginning of the line followed by any single character and then followed by checking any character between 2 or 3
No, it matches 2 or 3 of "any character". It'd match AB, QRZ, --, or anything that's two or three characters long.
So basically, this regex means "the third or fourth character must be a w".
Quote:
not able to get what this w for?
The letter "w" in the regex matches the letter "w" in the string.
Code:
ls -l | sed -n '/^.\{2,3\}w/p'
...
-rwxr-xr-x 1 oracle dba 330 Mar 24 16:42 trex.sh
...
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Cold anybody please help to build the regular expression using sed .
many thanks.
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please consider this:
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:confused:
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